False alarms happens from both payware and freeware it seems...
Most annoying...
I use Comodo Internet Security which includes firewall, antivirus and defense plus, and which is free from here:
http://personalfirewall.comodo.com/
I have however disabled their antivirus live protection: I got some false alarms about programs, which had been on my pc before and during Comodo was there, so again most annoying...
So, for the live antivirus protection, I have installed AVG, also freeware:
http://www.avg.com/
The freeware is if not better then at least just as good as the expensive payware from McAfee, Symantec (Norton) etc...
